Scientific Background

This widget is inspired by a
post
by the Scientist Stefan Rahmstorf in the german
Klimalounge Blog.
It illustrates the correlation of observed global mean temperature
anomalies with increasing CO2 and changes in the number of sun spots.

Please read the blog post
for more information on the scientific background. More References:

CO2 Data from the Law Dome ice core, Antarctica.
Reference:
Etheridge, D.M., L.P. Steele, R.L. Langenfelds, R.J. Francey, J.-M.
Barnola, and V.I. Morgan. 1996.
Natural and anthropogenic changes in atmospheric CO2 over the last 1000
years
from air in Antarctic ice and firn.
Journal of Geophysical Research 101:4115-4128.
http://cdiac.ornl.gov/ftp/trends/co2/lawdome.smoothed.yr20

A cron job updates them once a month.

Software

The Plotting Software is written by Bernd Herd, http://www.herdsoft.com/.
It is Free Software licensed unter GPLv2.